﻿/*
    Copyright Multi-Soft co.2009 
*/
using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;

namespace Rmlife.Common
{
    /// <summary> 
    /// 加密
    /// </summary> 
    public class AES
    {
        //默认密钥向量
        //private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
        private static byte[] Keys = { 0x41, 0x72, 0x65, 0x79, 0x6F, 0x75, 0x6D, 0x79, 0x53, 0x6E, 0x6F, 0x77, 0x6D, 0x61, 0x6E, 0x3F };
        /// <summary>
        /// DES加密字符串
        /// </summary>
        /// <param name="encryptString">待加密的字符串</param>
        /// <param name="encryptKey">加密密钥,要求为8位</param>
        /// <returns>加密成功返回加密后的字符串,失败返回源串</returns>
        //		public static string Encode(string encryptString, string encryptKey)
        //		{
        //			encryptKey = Utils.GetSubString(encryptKey, 8, "");
        //			encryptKey = encryptKey.PadRight(8, ' ');
        //			byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
        //			byte[] rgbIV = Keys;
        //			byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
        //			DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
        //			MemoryStream mStream = new MemoryStream();
        //			CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
        //			cStream.Write(inputByteArray, 0, inputByteArray.Length);
        //			cStream.FlushFinalBlock();
        //			return Convert.ToBase64String(mStream.ToArray());
        //
        //		}

        public static string Encode(string encryptString, string encryptKey)
        {
            encryptKey = Utils.GetSubString(encryptKey, 32, "");
            encryptKey = encryptKey.PadRight(32, ' ');

            RijndaelManaged rijndaelProvider = new RijndaelManaged();
            rijndaelProvider.Key = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 32));
            rijndaelProvider.IV = Keys;
            ICryptoTransform rijndaelEncrypt = rijndaelProvider.CreateEncryptor();

            byte[] inputData = Encoding.UTF8.GetBytes(encryptString);
            byte[] encryptedData = rijndaelEncrypt.TransformFinalBlock(inputData, 0, inputData.Length);

            return Convert.ToBase64String(encryptedData);
        }

        /// <summary>
        /// DES解密字符串
        /// </summary>
        /// <param name="decryptString">待解密的字符串</param>
        /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
        /// <returns>解密成功返回解密后的字符串,失败返源串</returns>
        //		public static string Decode(string decryptString, string decryptKey)
        //		{
        //			try
        //			{
        //				decryptKey = Utils.GetSubString(decryptKey, 8, "");
        //				decryptKey = decryptKey.PadRight(8, ' ');
        //				byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
        //				byte[] rgbIV = Keys;
        //				byte[] inputByteArray = Convert.FromBase64String(decryptString);
        //				DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
        //
        //				MemoryStream mStream = new MemoryStream();
        //				CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
        //				cStream.Write(inputByteArray, 0, inputByteArray.Length);
        //				cStream.FlushFinalBlock();
        //				return Encoding.UTF8.GetString(mStream.ToArray());
        //			}
        //			catch
        //			{
        //				return "";
        //			}
        //
        //		}

        public static string Decode(string decryptString, string decryptKey)
        {
            try
            {
                decryptKey = Utils.GetSubString(decryptKey, 32, "");
                decryptKey = decryptKey.PadRight(32, ' ');

                RijndaelManaged rijndaelProvider = new RijndaelManaged();
                rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey);
                rijndaelProvider.IV = Keys;
                ICryptoTransform rijndaelDecrypt = rijndaelProvider.CreateDecryptor();

                byte[] inputData = Convert.FromBase64String(decryptString);
                byte[] decryptedData = rijndaelDecrypt.TransformFinalBlock(inputData, 0, inputData.Length);

                return Encoding.UTF8.GetString(decryptedData);
            }
            catch
            {
                return "";
            }

        }

    }

    /// <summary> 
    /// 加密
    /// </summary> 
    public class DES
    {
        //默认密钥向量
        private static byte[] Keys = { 0x11, 0x22, 0x33, 0x44, 0xAA, 0xBB, 0xCC, 0xDD };
        /// <summary>
        /// DES加密字符串
        /// </summary>
        /// <param name="encryptString">待加密的字符串</param>
        /// <param name="encryptKey">加密密钥,要求为8位</param>
        /// <returns>加密成功返回加密后的字符串,失败返回源串</returns>
        public static string Encode(string encryptString, string encryptKey)
        {
            return Encode(encryptString, encryptKey, Keys);
        }
        public static string Encode(string encryptString, string encryptKey, byte[] encryptIV)
        {
            encryptKey = Utils.GetSubString(encryptKey, 8, "");
            encryptKey = encryptKey.PadRight(8, ' ');
            byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
            byte[] rgbIV = encryptIV;
            byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
            DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
            dCSP.Padding = PaddingMode.ANSIX923;
            MemoryStream mStream = new MemoryStream();
            CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
            cStream.Write(inputByteArray, 0, inputByteArray.Length);
            cStream.FlushFinalBlock();
            cStream.Close();
            return Convert.ToBase64String(mStream.ToArray());

        }

        /// <summary>
        /// DES解密字符串
        /// </summary>
        /// <param name="decryptString">待解密的字符串</param>
        /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
        /// <returns>解密成功返回解密后的字符串,失败返源串</returns>
        public static string Decode(string decryptString, string decryptKey)
        {
            return Decode(decryptString, decryptKey, Keys);
        }
        public static string Decode(string decryptString, string decryptKey, byte[] decryptIV)
        {
            try
            {
                decryptKey = Utils.GetSubString(decryptKey, 8, "");
                decryptKey = decryptKey.PadRight(8, ' ');
                byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
                byte[] rgbIV = decryptIV;
                byte[] inputByteArray = Convert.FromBase64String(decryptString);
                DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
                DCSP.Padding = PaddingMode.ANSIX923;
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Encoding.UTF8.GetString(mStream.ToArray());
            }
            catch
            {
                return "";
            }

        }


    }
}
